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Positive electrode lithium supplement additive and preparation method thereof, positive electrode and lithium ion battery

A technology of lithium-ion batteries and additives, which is applied in the direction of positive electrodes, battery electrodes, secondary batteries, etc., can solve the problems of unfavorable positive electrode lithium supplementation effect, low-temperature storage performance of batteries, deterioration, etc., and achieve irreversible capacity loss of supplementary discharge , Improve high-temperature storage performance, and suppress battery gas production

Active Publication Date: 2021-03-12
SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are lithium-supplementing additives in positive lithium supplementation, which lead to an increase in the impedance of the battery cell after delithiation, and an increase in gas production, which leads to a decrease in the high-temperature storage performance of the battery cell. In addition, such as Li 5 FeO 4 , Li 2 NiO 2 , Lithium ascorbate, lithium phytate and other positive electrode lithium supplement additive materials have poor stability and are sensitive to humidity. They are easy to react with water and carbon dioxide in the air in the air atmosphere, and are easily oxidized and deteriorated, which is not conducive to the positive electrode lithium supplement effect.

Method used

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  • Positive electrode lithium supplement additive and preparation method thereof, positive electrode and lithium ion battery

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Experimental program
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Effect test

Embodiment 1

[0049] The preparation steps of the positive electrode lithium supplement additive in this embodiment are as follows:

[0050] S1: Mix 100g of 4,4'-dimethylbiphenyl and 1000g of tetrahydrofuran evenly to obtain a dimethylbiphenyl solution, add 10g of metal lithium flakes to the dimethylbiphenyl solution and keep stirring, and the metal lithium flakes are stirring During the process, it is gradually complexed with dimethyl biphenyl to obtain an organic lithium solution;

[0051] S2: Add analytically pure vanadium pentoxide to the above organolithium solution, and continue to stir at room temperature for 10 hours. Driven by the potential difference, the lithium in the organolithium solution gradually intercalates into V 2 o 5 In the end, the positive electrode lithium supplement additive lithium vanadyl lithium salt Li 4 V 2 o 5 .

[0052] Cell preparation:

[0053] Preparation of positive electrode sheet: the positive active material LiNi 0.8 co 0.1 mn 0.1 o 2 , Li pr...

Embodiment 2

[0057] Based on Example 1, the only difference is that in Example 2, in the step S2 of preparing the positive electrode lithium supplement additive, stirring was continued at room temperature for 20 hours.

[0058] The chemical formula of the positive electrode lithium supplement additive lithium vanadyl salt prepared in this example is Li 4.5 V 2 o 5 .

Embodiment 3

[0060] Based on Example 1, the only difference is that in Example 3, in the step S2 of preparing the positive electrode lithium supplement additive, stirring was continued at room temperature for 40 hours.

[0061] The chemical formula of the positive electrode lithium supplement additive lithium vanadyl salt prepared in this example is Li 5 V 2 o 5 .

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Abstract

The invention discloses a positive electrode lithium supplement additive and a preparation method thereof, a positive electrode and a lithium ion battery. The positive electrode lithium supplement additive comprises a lithium vanadate, and the chemical formula of the lithium vanadate is Li <4+x> V <2> O <5>, wherein x is greater than or equal to 0 and less than or equal to 1. According to the invention, the battery cell impedance is reduced, the gas production of the battery is reduced, the high-temperature storage performance of the battery is improved, at the same time, the first effect of abattery cell can be significantly improved, and the battery cell energy density is further improved.

Description

technical field [0001] The present application relates to the technical field of batteries, in particular to a positive electrode lithium supplement additive, a preparation method thereof, a positive electrode and a lithium ion battery. Background technique [0002] Due to its high energy density, long cycle life and other advantages, lithium-ion batteries have been widely used in the fields of digital and electric tools. In recent years, the application of large-scale mobile energy storage batteries such as electric vehicles and drones has developed, and the development of lithium-ion batteries with higher energy density has become an important topic at present. The current common problem of lithium-ion batteries is that a large amount of lithium ions extracted from the positive electrode will be consumed during the first charging process to form an SEI film on the surface of the negative electrode. Second, lithium-ion batteries continue to consume active lithium during no...

Claims

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Application Information

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IPC IPC(8): H01M10/42H01M4/13H01M4/505H01M4/525H01M4/58H01M4/62H01M10/0525
CPCH01M10/4235H01M4/13H01M4/505H01M4/525H01M4/5825H01M4/622H01M4/625H01M10/0525H01M2004/028Y02P70/50
Inventor 陈鹏褚春波张耀
Owner SUNWODA ELECTRIC VEHICLE BATTERY CO LTD